Okay, so, if the m∠1 = 98°, then m∠3 must also equal 98°, because it is on the opposite side of m∠1
Remember, these must all add up to 360, so subtract 98 from 180, as 180 is half of 360.
180° - 98° = 82°
So, m∠2 and m∠4 = 82°
To check our work, simply add everything together.
m∠1 + m∠2 + m∠3 + m∠4 =
98° + 82° + 98° + 82° = 360°
So, m∠2 = 82°
m∠3 = 98°
m∠4 = 82°
~Hope I helped!~